Improve WYSIWYG editor modal style

less/prose-editor.less

@@ -300,17 +300,17 @@ li.ProseMirror-selectednode:after {
 
 .ProseMirror-prompt {
 	background: white;
-	padding: 5px 10px 5px 15px;
+	padding: 1em;
 	border: 1px solid silver;
 	position: fixed;
-	border-radius: 3px;
+	border-radius: 0.25em;
 	z-index: 11;
 	box-shadow: -.5px 2px 5px rgba(0, 0, 0, .2);
 }
 
 .ProseMirror-prompt h5 {
-	margin: 0;
-	font-weight: normal;
+	margin: 0 0 0.75em;
+	font-family: @sansFont;
 	font-size: 100%;
 	color: #444;
 }
@@ -323,7 +323,7 @@ li.ProseMirror-selectednode:after {
 }
 
 .ProseMirror-prompt input[type="text"] {
-	padding: 0 4px;
+	margin: 0.25em 0;
 }
 
 .ProseMirror-prompt-close {